In auto immune disease the enemy is from with in . As name implies "auto" is self and "immune " is immune system . One 's own immune system for unknown reason turns against self and destroys or damages tissues or cells . List of auto immune disease are many and growing . End result is destruction of of tissues such as thyroid , pancreas or cells such as white cells , platelets etc.
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3

Yes:
Autoimmune thyroid disease can manifest as an enlarged thyroid, abnormal thyroid antibodies on lab testing, sometimes nodular thyroid, and yet thyroid function can be normal, low, or high. Thyroid functions would be indicated by tsh, t4, T3 (liothyronine) levels. Thyroid ultrasound would look for nodules. There is no treatment for the autoimmune part, but abnormal thyroid function or nodules can be treated.
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4

Often same:
'thyroiditis' is an inflammatory process of the thyroid gland. Can be caused by virus, usually responds to anti-inflammatory medication and is self-limited. Hashimoto's thyroiditis similar, but is an autoimmune disorder where the antibodies attack the thyroid tissue, as though it was foreign. Over or underactive function could occur, but often becomes chronic and may need thyroid rx for life.
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5

Biopsy?:
There are many causes of lumps or nodules in the neck/thyroid. For the thyroid, they may be monitored over time by ultrasound and/or biopsied so that microscopic tissue can be examined (for possible cancer). Protocols for evaluating these are pretty straight forward, but if you have questions for your doctor, then please ask. Sounds like more info about your work-up might put your mind at ease.
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6

Yes but:
If the thyroid level is normal, then your symptoms are not caused by the thyroid but something else. Although you may be at a somewhat higher risk to develop another autoimmune disease , your problem may or may not be an autoimmune one.
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7

"all the symptoms":
Do not understand what you are describing, and cannot easily relate your thyroid to ms, or other neurological problems. If you had an immune thyroid issue, you could have other immune problems such as pernicious anemia. Provide more direct information, please.
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9

Life isn't that way:
To say "i want to be tested for all autoimmune diseases" is like saying "i want to meet everybody"... All 6-7 billion people. Life doesn't work that way. A person can see her primary care doctor first (important), who begins the evaluation and then refers to a rheumatologist as needed. Otherwise, a person can see the rheum. First, and then see her primary care doctor to complete her evaluation.
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The immune system developed to tell our own, normal cells (self) from foreign and abnormal cells (non-self). This lets the immune system eliminate viruses, bacteria, fungi and cancer cells from our body without harming normal cells. Sometimes the immune system fails to tell self from non-self and it attacks normal cells, for example in joints causing rheumatoid arthritis.
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